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Yes a few unmodified EPUBs I've tested work fine on iOS 16 with both page numbers and toc links without anchors. Before with iOS 15 and previous, all worked fine though I did for some reason need those fragment identifiers.
Any modified EPUB I haven't added to Books until after all changes. I am aware of cache issues and other. Really I'm not sure what is going on. Some quirk with iOS 16 that is different from macOS Books.
Maybe I'll test out some things. I use dashes in file names. Within the EPUB, I typically rename toc.xhtml to contents. That and a backup of nav typically named nav2, both remain unused in the spine or defined as nav but merely I use the former to make as mentioned H2+ links that I add to the original XHTML toc and the latter as a nav backup during the process. Maybe books gets confused as such. For landmarks, commercial epubs I've seen sometimes from what I recall have no toc defined plus isn't listed in the ncx as toc, or sometimes maybe such is. I've tried various changes and haven't figured out such yet.
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